High-speed display device, high-speed display method, and realtime measurement-projection device

1. A high-speed display device comprising: a video information input that inputs first video information expressed by original gradation values having a first number of bits at a first frame rate; a variation gradation value output that generates a set including M variation gradation values having a second number of bits smaller than the first number of bits corresponding to the respective original gradation values; a video information output that generates second video information having a second frame rate equal to M times the first frame rate by distributing the respective variation gradation values included in the set of the M variation gradation values to M frames; and a display that displays video based on the second video information, wherein M is an integer of 2 or more, and a sum of the M variation gradation values and the original gradation values of the first number of bits have a correlation in each set of the variation gradation values.

2. The high-speed display device of claim 1 , wherein the second video information is generated by distributing the respective variation gradation values included in the set of the M variation gradation values to the M frames in such an order that a number of times of increase/decrease between the variation gradation values in each set of the variation gradation values is maximum.

3. The high-speed display device of claim 1 , wherein the variation gradation value output includes a variation value output that outputs a variation value N having any value from 0 to M−1 corresponding to a (N+1)th variation gradation value when generating the set of the M variation gradation values corresponding to the respective original gradation values, and an image color reducer that generates the (N+1)th variation gradation value by dividing a sum of an original gradation value and the variation value N by a number of the M variation gradation values constituting the set of the M variation gradation values corresponding to the variation value N and truncating decimals of an obtained quotient.

4. A high-speed display method comprising: inputting first video information expressed by original gradation values having a first number of bits at a first frame rate; generating a set including M variation gradation values having a second number of bits smaller than the first number of bits corresponding to the respective original gradation values; generating second video information having a second frame rate equal to M times the first frame rate by distributing the respective variation gradation values included in the set of the M variation gradation values to M frames; and displaying video based on the second video information, wherein M is an integer of 2 or more, and a sum of the M variation gradation values and the original gradation values of the first number of bits have a correlation in each set of the variation gradation values.

5. The high-speed display method of claim 4 , wherein the second video information is generated by distributing the respective variation gradation values included in the set of the M variation gradation values to the M frames in such an order that a number of times of increase/decrease between the variation gradation values in each set of the variation gradation values is maximum.

6. The high-speed display method of claim 4 , wherein outputting a variation gradation value includes outputting a variation value N having any value from 0 to M−1 corresponding to a (N+1)th variation gradation value when generating the set of M variation gradation values corresponding to the respective original gradation values, and generating the (N+1)th variation gradation value by dividing a sum of an original gradation value and the variation value N by a number of the M variation gradation values constituting the set of the M variation gradation values corresponding to the variation value N and truncating decimals of an obtained quotient.

7. A real time measurement-projection device comprising: a video information input that inputs first video information expressed by original gradation values having a first number of bits at a first frame rate; a variation gradation value output that generates a set including M variation gradation values having a second number of bits smaller than the first number of bits corresponding to the respective original gradation values; a video information processor that generates second video information having a second frame rate equal to M times the first frame rate by distributing the respective variation gradation values included in the set of the M variation gradation values to M frames; a measurement pattern generator that generates a measurement pattern; a video output that alternately outputs the second video information and the measurement pattern; a projection device that projects an output of the video output onto a projection target; an imaging device that takes video of the measurement pattern projected onto the projection target; and a position calculation device for correcting the second video information based on a position of the projection target obtained by comparing the video of the measurement pattern obtained by the imaging device with an original measurement pattern, wherein M is an integer of 2 or more, and a sum of the M number of variation gradation values and the original gradation values of the first number of bits have a correlation in each set of the variation gradation values.

8. The real time measurement-projection device of claim 7 , wherein both an imaging time of the measurement pattern by the imaging device and a projection time of the second video information are shorter than a time when the imaging device reads the video of the measurement pattern and transfers the video to the position calculation device, and the video of the measurement pattern taken by the imaging device is started prior to completion of projection of preceding second video information.